I don't have data. It would likely take a while get the data from the "experiment" that showed that the availability of a suppressor increased the probability of a gun's being used in the commission of a crime.
The point is that given the availability of effective ear protection, there is no legitimate argument for civilian use of suppressors. There is no plausible argument that their existence would decrease the risk of a gun's being used illegally, and there are great reasons to believe that in some instances it would increase this risk, and/or make it more difficult to catch those who have done so.
Long range flamethrowers are illegal, but could be said to have a "legitimate use" for clearing brush. When there is no good argument for a thing to exist, and there are good safety-based arguments for it to not exist, then in the name of safety we should not have said thing.
The point is that given the availability of effective ear protection, there is no legitimate argument for civilian use of suppressors. There is no plausible argument that their existence would decrease the risk of a gun's being used illegally, and there are great reasons to believe that in some instances it would increase this risk, and/or make it more difficult to catch those who have done so.
Long range flamethrowers are illegal, but could be said to have a "legitimate use" for clearing brush. When there is no good argument for a thing to exist, and there are good safety-based arguments for it to not exist, then in the name of safety we should not have said thing.